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Property
|
Description
|
Parameter type
|
Boolean
|
Default value
| true |
Modifiable
| ALTER SYSTEM |
Range of values
| true | false |
Basic
|
No
|
Real Application Clusters
|
Multiple instances can have different values
|
OPTIMIZER_SECURE_VIEW_MERGING enables the optimizer to use view merging to improve query performance without performing the checks that would otherwise be performed to ensure that view merging does not violate any security intentions of the view creator.
Values:
·
false
Oracle does not perform security checks that may prevent view merging and predicate move-around.
·
true
Oracle performs checks to ensure that view merging and predicate move-around do not violate any security intentions of the view creator.
To take advantage of query rewrite for a particular query, you must disable the OPTIMIZER_SECURE_VIEW_MERGING parameter.Note:
1. Query for the current value of the parameter
select name, value, isdefault, isses_modifiable, issys_modifiable,
isinstance_modifiable, isdeprecated, description
from v$parameter
where upper(name) = ‘OPTIMIZER_SECURE_VIEW_MERGING’;
NAME
|
VALUE
|
IS
DEFAULT
|
ISSES_
MODIFIABLE
|
ISSYS_
MODIFIABLE
|
ISINSTANCE_
MODIFIABLE
|
IS
DEPRECATED
|
DESCRIPTION
|
optimizer_secure_view_merging
|
FALSE
|
FALSE
|
FALSE
|
IMMEDIATE
|
TRUE
|
FALSE
|
optimizer secure view merging
and predicate pushdown/movearound
|
